Welcome to VWwA Mac Dude
What I know is the 125kW 2.0 TDI (I think with DPF as Golf GT Sport has a DPF) will sell along side the current 103kW 2.0 TDI have a look in the VWwA Lounge to see 2008MY updates.
It will be available in August when 08MY lineup is introduced (orders in now possibly you would have to call your dealer )
As for the Common Rail TDIs I would expect them when the Passat gets a facelift in 2009MY so here by either early/mid 2009 or late 2009 as 2010MY Passat.
As to whether you should wait for the new tech its up to you but you may not like the facelift.
WARNING all info on when CR TDI makes it in the Passat is speculative so not 100% accurate
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